I have been thinking about using a cat litter box and the clumping type litter as my head...Has anyone tried this ?

Knot_Sea, it may cause problems if you were not introduced to a litter box at a young age. Apparently if as a youngster you didn't break yourself of the habit of spraying, you may continue this behaviour for the rest of your life and the litter box will have limited uses. Of course, a failsafe strategy for this problem is to get neutered. Is this an option?

__________________"The cure for anything is salt water: sweat, tears or the sea." Isak Dinesen"To me the simple act of tying a knot is an adventure in unlimited space." Clifford Ashley

A Jabsco head can be had for about $160 and a small tank needn't cost more than about $60. A three-way valve and some hose and clamps, and a deck pump-out fitting, maybe a through-hull for when you are offshore and can pump directly overboard, and you are good to go. Around $300 all together. And you don't have to keep buying kitty litter.